Phosphoric acid esters and their production



Patented May 25, 1954 UNITED STATES PATENT OFFICE PHOSPHORIC ACID ESTERS AND THEIR PRODUCTION Hans Gysin, Basel, Switzerland, assignor to J. R. Geigy A. G., Basel, Switzerland, a Swiss firm No Drawing. Application April 19, 1951, Serial No. 221,950

Claims priority, application Switzerland May 6, 1950 6 Claims.

This invention is concerned with new phosphoric acid esters and with their production. The new phosphoric acid esters are of the general formula:

wherein R represents a ri -cyclohexenone-yl radical which may be alkyl substituted, X represents oxygen or sulphur, and Y and Y represent alkoxy, alkoxyalkoxy, halogenalkoxy or alkylmercapto radicals.

It has been found that these compounds have an excellent insecticidal activity which is similar to that of the most active aromatic-aliphatic phosphoric acid esters such as p-nitrophenyldiethyl-thiophosphate. The toxicity, however, of the new compounds for warm blooded animals is considerably less than that of the above mentioned phosphoric acid esters, so that they are most suitable for the production of agents for combatting pests.

The new compounds can be produced by reacting aliphatic phosphoric acid ester halides or thiophosphoric acid ester halides of the general formula:

/Y Hal-P /Y Hal-P wherein Hal, Y and Y have the meanings given above, with alkyl substituted or unsubstituted enolisable 1,2- or 1.3-cyclohexanediones or their metal salts and then treating the cycloaliphaticaliphatic phosphorous acid esters so obtained of the general formula:

with sulphur or compounds giving 01f sulphur. The sulphuration can take place in the presence or absence of high boiling solvents such as odichlorobenzene, trichlorobenzene, polybromobenzene, aand ,B-chloronaphthalene, etc., at temperatures of from -200", in which process catalysts such as sodium polysulphides or phosphorus pentasulphide may be added.

It is also possible but less advantageous to react the cycloaliphatic compound with phosphoric acid halides or thiophosphoric acid halides be- This is done for then reacting the phosphoric acid monoester dichloride so obtained with two mols of ethyl alcohol or sodium alcoholate.

In particular, compounds derived from low aliphatic alcohols and mercaptans come into question as phosphoric ester halides of the general formula:

Such low aliphatic alcohols and mercaptans are, e. g. methanol, ethanol, n-propanol, isopropanol, allylalcohol, butyl alcohols and amyl alcohols, methoxyethanol, ethoxyethanol, ethylene chlorohydrine, ethylene fluorohydrine, methyl-, ethyl-, n-propyl-, isopropyland allyl mercaptan, and also butyland amyl-mercaptans. Some of the ester halides are already known. The other phosphoric acid ester halides can be produced in an analogous manner, e. g. by reacting phosphorus oxyhalides or phosphorus thiohalides with Thiophosphoric ester halides may also be obtained by sulphurating phosphorus acid dialkylester halides.

As phosphoric phosphoric acid or thiophosphoric acid-dimethylester chloride, diethylester chloride, -diethylester bromide, -methylethylester chloride, -dipropylester-chloride, -diisopropylester chloride, -diallylester chloride, thiophosphoric acid-O.S.di-

3 4 ethylester chloride, dithiophosphoric acid-S.S-di- CH; ethylester chloride, dithiophosphoric acid-O.S- g diethylester chloride; trithiophosphoric acid-di- H; methylester chloride, -diethylester chloride.

Alkyl substituted 1.2- and 1.3-cyclohexane- 5 ":.g 1. CH; diones insofar as they are enolisable, i. e. cong taining hydrogen at the carbon atom beside :or between the ketone groups, may be used as cyclohexanediones as well as cyclohexane'dione-. .(1".2) GB! OCECHICE (dihydrobrenzcatechin) and cyclohexanedione- (1.3) (dihydroresorcinol). i 5emethy1-dihydroresl\ orcinol and 5.5-dimethyl dihydroresorcinohidi- A OCHwHCH medone) come into question as. his type oialkyl substituted compounds, and also lmethyl-cyclohexanedione (2.3), l-methyl cyclohexandi'onel (2.4) l-methyl cyolohexanedione-QQ23) ,3 l-meth- O yl cyclohexanedione-(2.4), l-methyl cyclohexg anedione (2.6), 1 methyl cyclohexanedione- (3.4), 1.3-dimethyl cyclohexanedione-(4.5),' H10 CH isopropyl cyclohexanedione (3.5), 1.1.2 tri- E30 methyl cyclohexanedione-'(4.5), 'l-methyl-i-iso- 'propyl cyclohex'anedione= (213) p="menthanedime-(2.3), buchucamphor"or"diospheno1],'1- B 0 methyll-isopropyl.cyclohexanedione-(lfi) (:p- OCH; 00in; menthanedione-(2.6) all of which are known. 25 RrfP/ The following examples serve to illustrate the b 1 invention. Parts are always given as parts by weight and temperatures are in degrees centi- 001% 001K grade. v @P 1 EXAMPLE 1 Room 1 Lboom,

500 parts of -benzene-and 70"parts ofdehy- .1 "drated potassium-carbonate areadded to 112 -parts;of'dihydroresorcinoland thewater-iormed 3 onneutralisationis'removed-by azeotropic-distil- ,35 5

lation. Thereaction product -is-- then cooled-to "60; -190'parts-of diethyl'thiophosphoric acid chlo- -OB ride are'a'dded' dropwise; whereupon the whole is a d 'f 'heated'for l0-hours underreflux to complete the 36GB, ,OCHzOEZGHl 'reaction. When cool,-potassium carbonate solu- .40 tionisadded until a; phenolphthalein alkaline ref i f actionis'obtained and; themixture is'well stirred. ,0 CH; 'o -oomorbcm The aqueous portion "is then removed from'the benzene: layer. After"distillingoff"'thebenzene, '"dihydroresorcyl=diethylthiophosphoric acidester x is'obt'ained as a' reddish coloured-almost odour- QC "less liquid whichicannot' be fdistilled without'a Hi0 H littleflecomposition. "Theiawproductis'suitable for the production of active insecticidal sprays and dusting agents. H A; R

EXAMPLE 2 162 parts of dimedone sodium (produced for v J example-irom-edimedone anda calculated amount fi .oLcaustic.- soda lyecand. careful evaporation t0 {Aw em QChH. dryness) rarer, suspended in 500; partsof toluene 0cm OCH andthene-heated withl'liparts of diethyl phos- I p phoricacidchloride, ior.8 hours under reflux On k 'T .;completion of. the reaction, thesodium chloride 0011: g 0.0m. which-,;has'xbeen formed is filtered OE and the 0 xsolventis distilled off. [5.5:dimethylcyclohex- .ene A one-(3) -yl] :diethyl phosphoric .acid ester remains as apale.colouredliquidland can H1O :beused withoutanyi further purification for the 11,0 l" productionofzactiveinsecticidalpreparations. 2 :.The. following: compounds canbe produced in -a mannerzanalogousrto those describedinExam- H pics. 1 and 2: 0 0H: 001B.

5 O Hrs-P \l\ OCH: 0 OCaHl .1120 CH .00m .0.0111 1 age I -o--R' --i The biological properties of the new compounds can be applied in the most varied fields of pest can be used as such, e. g., in the form of powder or dispersed in the atmosphere as gas, mist or smoke. However, for most purposes it is more nature. By adding wetting agents and protec tive colloids such pulverulent preparations may together.

Solutions (for spraying) in high boiling solents, such as kerosene and similar mineral oil fractions or in methyl-naphthalenes, xylenes and the direct spraying of the object treated, Solutions in low boiling solvents such as trichlorethylene, tetrachlorethane, ethylene chloride are suitable for spreading the active ingredient in the form of a mist. The latter well as, e. g., benzine, xylene and chlorobenzene are also suitable in the impregnation of packing materials.

Fluoro-trichloromethane and difluorodichloromethane are examples of solvents and propellent agents suitable for use in aerosols.

As emulsifying agents there come into consideration those of a cation active nature, such as quaternary ammonium compounds, as well as anion active agents such as soap, soft soap, aliphatic monoesters of sulphuric acid and aliphatic-aromatic sulphonic acids, furthermore, non-ionogenic emulsifiers such as higher molecular condensation products of ethylene oxide. They are mixed with the active ingredients to form emulsion concentrates with or without the addition of suitable solvents such as e. g., acetone, alcohols, cyclohexanone, benzene, toluene, xylene, tetrahydronaphthalene, alkylated naphthalenes, phthalic acid esters, mineral and vegetable oils and, if required, water.

White petroleum jelly and other ointment bases in which the active ingredient can be incorporated, are suitable semi-solid extenders.

The active compounds may also be used together with an attractive or lure such as sugar to form a bait, for instance as a dusting agent with sugar as the main carrier, or as sprays or fly catchers.

The difierent formulations can be better adapted for the various uses intended in the usual way, i. e. by the admixture of additives improving the distribution, adhesive powers and resistance to rain, on the treated surface. Examples of such additives are fatty acids, resins, wetting agents, glue, casein or alginates. Similarly, their biological activity can be extended by the addition of substances with bactericidal, fungicidal or insecticidal properties.

As bactericides there come into consideration, for example, chlorinatedv phenols and quaternary ammonium compounds; suitable fungicides include e. g., sulphur in all its various forms .of application such as lime sulphur liquid, copper compounds such as copper oxychloride or Bordeaux liquid, and fluorides. As examples of further insecticidal compounds there may be named: synthetic products like 1.1-bis-(p-chlorophenyl)-2.2.2-trichlorethane, 'y-hexachlorocyclohexane, hexaethyl tetraphosphate, tetraethyl pyrophosphate, chlorinated camphene and 1.2.4.5.6.7.8.8-octachloro 4.7,- methano-3a.4.7.7atetrahydroindane and 5.5-dimethyl-dihydroresorcinol dimethylcarbamate; suitable vegetable products are pyrethrin and rotenone.

In the following examples parts are always given as parts by weight.

EXAMPLE 3 Dusting agent 1 part of active ingredient, e. g. dihydroresorcyl diethyl-thiophosphoric acid ester, is thor- EXAMPLE 4 Spraying agent. (suspension) EXAMPLE 5 Emulsion 20 parts of active ingredient are dissolved in 40 parts of a solvent be used as solvents. The emulanionic, kationic or non-ionogenic.

kerosene can gators may be As examples EXAMPLE 6 Solution (spray) R-OP\ Y! wherein R represents a radical selected from the group consisting of A -cyclohexen-B-one-yl, alkyl-substituted A -cyclohexen-3-one-yl, A cyclohexen-fi-one-yl and alkyl-substituted A cyclohexen-6-one-yl, X represents a member may be one of the following 

1. A PHOSPHORIC ACID ESTER OF THE FORMULA 